Several Democratic mayors, including Bill de Blasio in New York City, London Breed in San Francisco, Lori Lightfoot in Chicago, Muriel Bowser in Washington D.C., Jim Kenney in Philadelphia, Michelle Wu in Boston, and Eric Garcetti with the Los Angeles City Council, required proof of COVID-19 vaccination to enter indoor restaurants (and often similar venues) during the 2021–2022 Delta and Omicron surges.